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Cowsar vs MDX: heat pump ratings compared

Against heat pumps of the same size and type, a typical Cowsar model beats 34% and a typical MDX model 66%. MDX rates higher overall.

Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated

Cowsar

34%

of similar heat pumps beaten by its typical model

Well below average

12 models listed

MDX

66%

of similar heat pumps beaten by its typical model

Well above average

12 models listed

Rating by ratingEach bar is the share of same-size, same-type heat pumps that a typical model beats, so the two brands compare fairly even if they make different sizes.
  • Efficiency on a 5°F dayCOP at 5°FCowsar: Beats 61%MDX: Beats 81%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FCowsar: Beats 28%MDX: Beats 64%
  • Winter-long heating efficiencyHSPF2Cowsar: Beats 25%MDX: Beats 79%
  • Summer-long cooling efficiencySEER2Cowsar: Beats 36%MDX: Beats 70%
  • Hot-day cooling efficiencyEER2Cowsar: Beats 23%MDX: Beats 46%

Average (50%)Dashed outline: the other brand, for comparison

Want ranks, distributions per size class and cold-weather curves? Switch to Advanced

Rebate standards

Share of each brand’s models that meet the level. Programs can have other rules too.

  • CEE 2025

    Cowsar
    75%
    MDX
    92%

  • Xcel CC

    Cowsar
    50%
    MDX
    92%

  • CEE Advanced

    Cowsar
    0%
    MDX
    17%

  • ENERGY STAR CC

    Cowsar
    0%
    MDX
    100%

All-around best, ducted up to 1.5 tons

Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.

Showing Ducted, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

Cowsar

No ducted, up to 1.5 tons model from Cowsar.

MDX

No ducted, up to 1.5 tons model from MDX.

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

Next steps

The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.

Open the advanced view